C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

cleaned intake with sea foam

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Old Jun 4, 2012 | 08:15 PM
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Default cleaned intake with sea foam

I cleaned the intake manifold with sea foam through the brake booster hose and for some reason it was leaking out of the block below the valve cover on the passenger side of the motor. It was running on the exhaust and smoking, the same on the drivers side. It was not very much but I don't think this is good. Any ideas why? Any ideas where it was coming out? This could be the problem why it is missing. I found 2 vacuum leaks and made repairs but still missing. Thanks in advance for the help.
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Old Jun 4, 2012 | 08:22 PM
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Why would you pour liquid into a running engine?

If this was a spray...I can understand that...but liquid 'sea-foam' ?
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Old Jun 4, 2012 | 08:40 PM
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Originally Posted by senter9
....it was leaking out of the block below the valve cover on the passenger side of the motor. It was running on the exhaust and smoking, the same on the drivers side.
Cracked block?
Maybe an exhaust gasket?

I'd take a section of tubing or garden hose and use it like a stethoscope to listen for the leaks.

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Old Jun 4, 2012 | 08:48 PM
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A little too much.. This is why the internet is great.
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Old Jun 4, 2012 | 08:54 PM
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From C5 tech but still applies.. As to leaking, similar to vac. leak??http://forums.corvetteforum.com/c5-t...-got-pics.html
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Old Jun 4, 2012 | 09:09 PM
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There was smoke leaking or liquid?
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Old Jun 4, 2012 | 11:56 PM
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Originally Posted by leesvet
Why would you pour liquid into a running engine?

If this was a spray...I can understand that...but liquid 'sea-foam' ?
Old backyard mechanic trick, I have also seen this performed in dealerships and shops. Disconnect brake vacuum line, stick it in the can of Sea Foam and suck it all out, then shut engine off (if it doesn't choke down) and let it soak for about 30 minutes. It will clean an engine's intake system. Also recommend changing oil & filter after doing this....

If OP was seeing it "leaking out of the block below the valve cover on the passenger side of the motor", sounds like exhaust leakage to me...or loose spark plugs.
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Old Jun 5, 2012 | 01:05 AM
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Ya I just stuck the hose in the can and let the vacuum suck it dry. Maybe I should have done a little at a time. Out of the info I obtained from this enlightenment I'm going to go with exhaust leak where the header attaches to the block.
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Old Jun 5, 2012 | 01:21 AM
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I beleive the directions say to slowly tip the can up to the hose and slowly let it draw the seafoam in.

Letting is glug a bunch of liquid anything at one time is a good way to hydrolock the engine bending every rod in it or blow gaskets out.

Youll probably be Ok
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Old Jun 5, 2012 | 02:35 AM
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Originally Posted by cuisinartvette
I believe the directions say to slowly tip the can up to the hose and slowly let it draw the seafoam in.


I used this procedure on my XJ and it did help reduce mosquitoes and lifter noise when added to the oil.

I add a can to a full tank of fuel once a year or 15,000 miles.

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Old Jun 5, 2012 | 07:20 AM
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Originally Posted by cuisinartvette
I beleive the directions say to slowly tip the can up to the hose and slowly let it draw the seafoam in.

Letting is glug a bunch of liquid anything at one time is a good way to hydrolock the engine bending every rod in it or blow gaskets out.

Youll probably be Ok
This is exactly why I tell people to use a small funnel to pour the seafoam into the brake booster hose, you can control how much goes into the car and not over do it.. These youngsters never listen.......WW
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Old Jun 5, 2012 | 01:01 PM
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Originally Posted by cuisinartvette
I beleive the directions say to slowly tip the can up to the hose and slowly let it draw the seafoam in.

Letting is glug a bunch of liquid anything at one time is a good way to hydrolock the engine bending every rod in it or blow gaskets out.

Youll probably be Ok
We did a lot of BG fuel service at the dealership its a similar process. You don't pour it all in
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Old Jun 5, 2012 | 03:12 PM
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Originally Posted by ch@0s
We did a lot of BG fuel service at the dealership its a similar process. You don't pour it all in
Yep, I should have been more specific...a little at a time, I didn't mean suck the whole can dry in one shot. You're right, ch@os, that's
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Old Jun 6, 2012 | 01:07 AM
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I've heard of people using the small "straws" that come on cans of carb cleaner, etc. to suck out the Sea Foam so you have much better control of how much goes into the engine. I'd put it in a glass container so you can see what's happening.

Years ago I was at a dealer and saw a mechanic using a radiator filler hose to POUR water into a carburetor on a station wagon. He had the thing revved up to about 3000 RPM. I was amazed that it could take that much water and keep running.
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Old Jun 6, 2012 | 01:21 AM
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Originally Posted by Cliff Harris
Years ago I was at a dealer and saw a mechanic using a radiator filler hose to POUR water into a carburetor on a station wagon. He had the thing revved up to about 3000 RPM. I was amazed that it could take that much water and keep running.
I've seen old-time mechanics use Windex and do the same thing, spraying it into the carb's venturis...claimed it blew the carbon off the valves and piston tops. Thing is, I bet some of those old engines are still running.
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Old Jun 6, 2012 | 08:20 AM
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Originally Posted by Phat98
I've seen old-time mechanics use Windex and do the same thing, spraying it into the carb's venturis...claimed it blew the carbon off the valves and piston tops. Thing is, I bet some of those old engines are still running.
I have done that dozens of times and it does remove carbon from pistons valves etc. It is the same result as the very clean cylinder head / piston you find with a bad head gasket. The engine will stand a lot more water than you might imagine and the amout of crap that comes out of the exhaust is amazing, definately do this outside. The 3000 rpm is so you do not lock up the engine and so it will keep running. Definately do this before you change plugs though as it may foul them and may clean them it's a 50/50 chance either way. You don't need any fancy chemicals just plain old tap water does fine. It turns to steam in the cylinder and steam cleans everything though does nothing for manifold or back side of the intake valve. Older engines could carbon up to the point pistons hit cylinder head or valves not seat.

Dave
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